3728505905 has 4 divisors (see below), whose sum is σ = 4474207092. Its totient is φ = 2982804720.

The previous prime is 3728505899. The next prime is 3728505967. The reversal of 3728505905 is 5095058273.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5095058273 = 6053 ⋅841741.

It can be written as a sum of positive squares in 2 ways, for example, as 2876391424 + 852114481 = 53632^2 + 29191^2 .

It is not a de Polignac number, because 3728505905 - 2¹² = 3728501809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372850586 + ... + 372850595.

It is an arithmetic number, because the mean of its divisors is an integer number (1118551773).

Almost surely, 2^3728505905 is an apocalyptic number.

It is an amenable number.

3728505905 is a deficient number, since it is larger than the sum of its proper divisors (745701187).

3728505905 is an equidigital number, since it uses as much as digits as its factorization.

3728505905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745701186.

The product of its (nonzero) digits is 378000, while the sum is 44.

The square root of 3728505905 is about 61061.4928166680. The cubic root of 3728505905 is about 1550.6422458140.

The spelling of 3728505905 in words is "three billion, seven hundred twenty-eight million, five hundred five thousand, nine hundred five".